aa = ['a', 'b', 'c', 'd']
bb = ['1', '2', '3', '4']
n = 0
for i in aa:
    for j in range(len(aa)):
        # print('nihao'+j)
        # print(i+'_'+str(j+1))
        print(i+'_'+str(n))
        n = n+1

        pass
    # print(n)


# # print(len(aa))
# for i in range(len(aa)):
#     print(i)
str1 = ''
number1 = list(range(1, 10))
number2 = list(range(1, 10))
for i in number1:
    # print(type(i))
    for j in number2:
        if j <= i:
            str1 += str(i) + '×' + str(j) + '=' + str(i * j) + '\t'
    str1 += '\n'
print(str1)
# bb = [1, 2,3, 4]

str2 = ''
number3 = list(range(1, 11))
number4 = list(range(1, 11))
for i in number3:
    # print(type(i))
    for j in range(10-i, -i):
        # if j = i:
        #     str2 = str2 + '★'
        str2 = str2 + '★'

    str2 += '\n'
print(str2)
# bb = ['1', '2', '3', '4']
for j in bb:
    for i in aa:
        print(str(j)+i)

for i in range(10):
    for j in range(0, i):
        print(" ", end='0')
    for k in range(i, 10):
        print("★", end='')
    print("")

for i in range(10):
    print(i, end="")

li = [11, 22, 33]
for k, v in enumerate(li, 1):
    print(k, v)
